I've had an xbox 360 since 2006 so never really played the PS3 until I bought a second hand Fatty last year.
It is now my favourite console, possibly of all time.
Mine is an old 40GB model with a 600 GB drive now installed. Runs great.
Like others have said, the exclusives are really awesome.
Motorstorm series, GT5, Wipeout HD Fury, God Of War III, Demon's Souls, Heavenly Sword, Twisted Metal, Killzone 3, Uncharted series....etc.....etc.
All are brilliant and the games at the moment a really cheap. Currently paying 3 for 5 bucks at my local pawn shop.
Saturday's pickups were Heavenly Sword, Red Faction Guerilla and Brutal Legend.
(Also a great BluRay player and media server.)